The heat of combustion of methane (CH2) is -890 kJ mol-1. a) Write a thermochemical equation for the complete combustion of methane.
b) Determine the mass of methane (in g) that has to be burnt in order to heat 500 mL of water from 20.0°C to boiling. Assume all the heat released was used to heat the water.

the answer to this question is 3.

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.

they all get energy from eating other animals, dead animals to be more precise.

hienas tends to steal pray from other animals. crows and vultures tend to eat dead animals and leftovers.

hope it ,

bioteacher101